Exhaust gas purifier

Abstract

In an exhaust gas purifier provided in an engine, a filter regeneration control recovering a PM collecting capacity of filter means on the basis of a chemical reaction can be efficiently executed by a simple structure. An exhaust gas purifier in accordance with the present invention is provided with a particulate filter (50) for purifying an exhaust gas arranged in an exhaust path of an engine (5), an actuation portion hydraulic pump (101) driving on the basis of a power of the engine (5), a pressure sensor (68) capable of detecting a clogging state of the particulate filter (50), and a pressure control valve (104) and a switching solenoid valve (106) for forcibly increasing an actuation amount of the actuation portion hydraulic pump (101). The filter regeneration control increasing an engine load is executed by increasing a discharge pressure of the actuation portion hydraulic pump (101) in accordance with a pressure control of the pressure control valve (104) on the basis of detection information of the pressure sensor (68).

Description

TECHNICAL FIELD[0001]The present invention relates to an exhaust gas purifier for purifying an exhaust gas in an internal combustion engine such as a diesel engine.BACKGROUND ART[0002]Conventionally, there has been carried out a collection of a particulate matter (hereinafter, referred to as PM) in an exhaust gas by using a particulate filter (hereinafter, referred to as filter), for purifying the exhaust gas, in an internal combustion engine, particularly in a diesel engine. In this case, if the PM collected by the filter exceeds a predetermined amount, a distribution resistance within the filter is increased so as to cause a reduction of an engine output. Accordingly, there has been carried out a recovery of a PM collecting capacity of the filter (a regeneration of the filter) by removing the PM deposited on the filter.[0003]As one example of this kind of regeneration system, there is a chemical reaction type regeneration system. The chemical reaction type regeneration system is s...

AI Technical Summary

Benefits of technology

[0018]In accordance with the present invention, since the structure is provided with the filter means for purifying the exhaust gas arranged in the exhaust path of the engine, the hydraulic load mechanism driving on the basis of the power of the engine, the clogging detecting means capable of detecting the clogging state of the filter means, and the forced actuation valve means for forcibly increasing the actuation amount of the hydraulic load mechanism, and the filter means is regenerated by increasing the engine load while maintaining the engine rotating speed, by increasing the actuation amount of the hydraulic load mechanism with the actuation of the forced actuation valve means on the basis of the detection information of the clogging detecting means, it is possible to oxidize and remove the PM by forcibly raising the exhaust gas temperature, for example, even if the drive state of the engine at the current time point is a state in which the PM can neither be oxidized nor be removed, but is deposited on the filter means. Accordingly, there can be achieved such an effect that the PM collecting capacity of the filter means can be securely recovered regardless of the drive state of the engine (the state of the rotating speed and the load).

Problems solved by technology

As a result, the filter is clogged.

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